Vibration Type Driving Apparatus Speed Synchronization
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Solution Overview
Problem
Vibration type motors with multiple vibrators face efficiency issues due to speed differences caused by individual variations in resonance frequencies, leading to increased slip and sliding losses when driven by a common circuit, which complicates the design and increases costs.
Innovation Solution
The solution involves arranging vibrators in a configuration where the first and second vibrators are connected in series with a capacitor, allowing for voltage ratio adjustment based on speed differences to synchronize their speeds, thereby reducing the impact of resonance frequency variations and enhancing driving efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If multiple vibrators are driven by a common driving circuit, then device complexity is reduced and cost decreases, but speed uniformity deteriorates due to individual variation in resonance frequency
Solution Approach 1:
The patent applies parameter changes by introducing electric elements (capacitors or inductors) with specific constants to alter the electrical parameters of the driving circuit. This allows adjustment of the driving frequency for each vibrator to match its individual resonance frequency, thereby achieving uniform speed while using a common driving circuit structure.
Solution Approach 2:
The patent uses electric elements (capacitors or inductors) as intermediary components between the common driving circuit and individual vibrators. These intermediary elements enable frequency adjustment without requiring separate driving circuits for each vibrator, thus maintaining simplicity while achieving speed uniformity.
2Speed
If driving frequency is adjusted to match resonance frequency, then vibration amplitude and driving speed increase, but individual variation in resonance frequency causes speed difference among vibrators
Solution Approach 1:
The patent changes the electrical parameters (capacitance or inductance) of the driving circuit to adjust the driving frequency for each vibrator. This allows each vibrator to operate at its optimal resonance frequency for maximum speed while maintaining consistent speed across all vibrators through proper selection of electric element constants.
3Stability of the object's composition
If individually adjusted driving circuits are provided for each vibrator, then speed uniformity is improved, but device complexity and cost increase
Solution Approach 1:
The patent creates a universal driving circuit structure that can drive multiple vibrators with different resonance frequencies. By incorporating adjustable electric elements into a common driving circuit, the system achieves the functionality of multiple individual circuits while maintaining a unified structure, thereby reducing complexity and cost.
4Device complexity
If vibrators with different resonance frequencies are driven at the same frequency, then device complexity is reduced, but slip and sliding losses increase due to speed differences
Solution Approach 1:
The patent changes the electrical parameters of the driving circuit by introducing capacitors or inductors with specific constants. This enables frequency adjustment that matches each vibrator's resonance frequency, eliminating speed differences and reducing slip and sliding losses while maintaining a relatively simple driving circuit configuration.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration effectively reduces speed differences among vibrators, decreases slip and sliding losses, and improves the overall efficiency of the vibration type driving apparatus, allowing for higher speeds and reduced power consumption.
Implementation Method 1
a vibration wave motor serving as an example of a vibration type actuator is a non-electromagnetic driving type motor configured to generate, by applying an alternating voltage to an electro-mechanical energy conversion element such as a piezoelectric element
Implementation Method 2
the closer a driving frequency comes to a resonance frequency of the piezoelectric element, the larger vibration amplitude becomes
Data Source
AI summary
A vibration type driving apparatus includes a first vibrator including an electro-mechanical energy conversion element and configured to be in pressure contact with a driven member, a second vibrator including an electro-mechanical energy conversion element and configured to be in pressure contact with the driven member, and a first electric element connected in series with the second vibrator. The first vibrator is connected to a driving circuit, the second vibrator and the first electric element are connected in parallel with the first vibrator, the second vibrator is connected to the driving circuit via the first electric element, and a resonance frequency f of the first vibrator and a resonance frequency f2 of the second vibrator satisfy a relationship f1<f2.